S2Cells::CellId

Conversion of from_face_ij_wrap method

returns a cell given a hex-encoded string of its uint64 ID

The comparison operator. Returns 0 if the two objects are equal, a negative number if this object is considered less than other, a positive number if this object is considered greater than other, or nil if the two objects are not comparable.

Subclasses define this method to provide class-specific ordering.

The comparison operator is usually used to sort values:

# Sort in a descending way:
[3, 1, 2].sort { |x, y| y <=> x } # => [3, 2, 1]

# Sort in an ascending way:
[3, 1, 2].sort { |x, y| x <=> y } # => [1, 2, 3]

Compares this object to other based on the receiver’s <=> method, returning true if it returns 0.

Also returns true if this and other are the same object.

def child(pos : Int) raise "Invalid cell id" unless valid? raise "Child position out of range" if leaf? new_lsb = lsb >> 2 self.class.new(@id &+ (2 * pos + 1 - 4) &* new_lsb) end

Generates an UInt64 hash value for this object.

This method must have the property that a == b implies a.hash == b.hash.

The hash value is used along with == by the Hash class to determine if two objects reference the same hash key.

Subclasses must not override this method. Instead, they must define hash(hasher), though usually the macro def_hash can be used to generate this method.

Same as #inspect(io).

ToToken returns a hex-encoded string of the uint64 cell id, with leading zeros included but trailing zeros stripped.